. The art of landscape gardening. Fig. 27. lead pencil, or even ones finger, in such a manner as to pro-duce the respective shadows d v and D K; c being a pieceof red glass in this experiment. 8. If, instead of red glass, a piece of green glass be placed atc, then the shadow d v will no longer be green, but of a red-dish cast; and so of the rest as mentioned above, at section 3. 9. My friend was very desirous that I should endeavourto account for these beautiful and most extraordinary appear-ances ; with this view, I first observe that the burning lights,A and B, when the experiments are made
. The art of landscape gardening. Fig. 27. lead pencil, or even ones finger, in such a manner as to pro-duce the respective shadows d v and D K; c being a pieceof red glass in this experiment. 8. If, instead of red glass, a piece of green glass be placed atc, then the shadow d v will no longer be green, but of a red-dish cast; and so of the rest as mentioned above, at section 3. 9. My friend was very desirous that I should endeavourto account for these beautiful and most extraordinary appear-ances ; with this view, I first observe that the burning lights,A and B, when the experiments are made without daylight, maybe reckoned nearly white, particularly if they are made to burnwithout smoke, though, in reality, they are yellowish, or evenorange-coloured sometimes, as is very plain when they arecompared with strong daylight. 10. Secondly, white light is well known to consist of sev-eral other colours, as red, orange, yellow, green, blue, purple, Notes 247 and violet; and, further, as violets and purples, vi^ith all their
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